In Romans, so far, Paul has introduced the saving gospel as by Sola Fide, now he begins to explain the urgency of believing the gospel — despite all mankind knowing God, they suppress his truth, and God’s wrath is revealed upon all nations in their grossest sin:  God-making.

Big Point: In v16-17, Paul has introduced the saving gospel as by Sola Fide, now he begins to explain the urgency of knowing the gospel—because of the wrath of God and three reasons why the wrath of God is righteous/just. 18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness…